I might suggest using the term "secondary email" for those kinds of
additional email addresses, keeping the term "primary email" for the one we
use now. Facebook does the same.

That leaves the open question raised by your first message, Ryan: can users
change their primary email? I suspect that's something of a service
question; clients would sign out then sign in again, perhaps with an
account-server-driven error flow.

On Mon, May 11, 2015 at 10:32 AM, Ryan Feeley <[email protected]> wrote:

>
>
> On Mon, May 11, 2015 at 12:19 PM, Nicholas Alexander <
> [email protected]> wrote:
>
>>
>> What does "email opt-in" mean?  Does it mean that we allow accounts with
>> no email address that later opt-in to an email loop?  Or does it mean a
>> marketing-speak opt-in where users accept our engagement emails?
>>
>
> The latter, engagement emails.
>
>
>> I would like to surface that Firefox for Android has an expectation that
>> accounts are keyed by a single email address that does not change over
>> time.  It will be challenging to change this [1].  Just something to be
>> aware of.
>>
>
> Definitely not proposing that a user can log in with more than one email,
> just that additional emails can be used to enhance to account: strengthen
> password reset with an additional email, add an additional email to be
> reachable by more emails in Hello (a la iMessage),  and choose which email
> accounts to review activity notifications and newsletters.
>
>
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